Electric-arc lamp



(No Model.)

B. SEGERDAHL.

ELECTRIC ARG LAMP.

Patented Sept. 3, 1895.

MTIZCSMS:

5 come together.

Unites States PATENT @nnrcn.

RUDOLPIISEGERDAHL, OF CHICAGO, ILLINOIS.

ELECTRIC-ARC LAMP.

SPECIFI UATION forming part of Letters Patent No. 545,736, datedSeptember 3, 1895.

Application filed April 26, 1394.- fserai No. 509,134. fNo model.)

To all whom it may concern:

Be it known that I, RUDOLPH SEGERDAHL, a citizen of the United States,residing at Ohicago, in the county of Cook and State of Illi- 5 nois,have invented a certain new and useful [0 specification.

My invention relates more particularly to are lamps; and the objects ofmy improve ment are, first, to provide means whereby two or more sets ofcarbons may be operated in the same circuit and caused to burn insuccession; in fact, any number that may under certain conditions bedesired, so that the service of the lamp may be increased and frequentrenewal of carbons avoided; second,

to obtain a regulation of the different carbons so operated adapted tomaintain the successive arcs of a uniform voltage, and, third, to obtaina durable structure. I attain these ob ects by providing each set ofcarbons with an independent regulating mechanism, and,

having found a lamp construction, as illustrated and described in myPatent No. 486,801, granted April 24, 1894, peculiarly adapted to servemy purpose, I prefer to use the same.

0 Briefly stated, the general construction of said lamp is as follows:The carbons in the lamp are normally held separated until thefeeding-magnet placed in shunt of the are becomes energized,which causesthe carbons to The lamp-circuit being thus completed, the arc in thelamp is established and maintained until said carbons are consumed to acertain point, when by means of an automatic cut-out the circuit in saidshunt- 0 magnet is broken and maintained open until lamps, and,speaking. generally, my invention consists'of two or more are lampsembodying the above features, arranged in groups and in parallelconnection, derived c rcuits and switching devices for said circuitsadapted to cause the circuits of the respective lamps in the group to beformed successively, thus causing one lamp to burn after the other.

In the accompanying drawing I have shown two lamps of similarconstruction in connection with circuits and switching devices embodyingmy invention. Each of said lamps is provided with a feeding or shuntmagnet a and a, respectively, and adapted to operate in the mannerpreviously referred to. The insulating-blocks c and c, to which thecontacts 01 e and d 6', located in the shunt-circuits of theirrespective lamps, are secured, and the levers b and b constitute theautomatic cutout devices previously referred to, forming no part of mypresent invention.

f and f" are fixed contacts, which will be more fully referred tohereinafter.

As previously stated and shown in the accompanying drawing, I arrangethe lamps I desire to operate in parallel. Furthermore, I arrange allthe lamps in the group, except the one intended to operate first, withtheir respective circuits normally open. This one lamp referred to andintended to operate first, Fig. 1, I will call the king lamp. Itscircuit through the feed-magnet a is normally closed, and the carbons inthis lamp may also normally be in a closed circuit Without defeating theobject of my invention; but as it in that case will be necessary to usea magnetic lifting device to separate said carbons I prefer to use thearrangement as shown and in which the carbons are normally heldseparated.

My invention and its operation will be more fully understood by tracingthe circuit 'through the positive wire entering the shuntmagnet athrough the contacts (1 c and out through the negative wire. The lamp 1is .thus normally in circuit through its shuntshunt-magnet ct, so thatwhen the circuit is broken at the contacts cl 6 a circuit is completedthrough the shunt-magnet a by the contact 6 being pressed against thecontact f, thus causing the armature g to be attracted, which permitsthe carbon governed by the same to descend and complete its circuit.This formed circuit being of alower resistance than the arc in the firstlamp, causes its arc to be extinguished and the are in the second lampto be formed without any interruption of the light service. This secondlamp may, as shown, be provided with a similar switching device as lamp1, and a contact f with connections to the same adapted to introduce athird lamp in the group; and it will readily be understood, whenreferring to the above description, how this third lamp, or, in fact,any number of lamps, may be introduced in the same group and caused tooperate as specified.

The advantages of having the switchingcontacts above referred to placedin high-resistance circuits is readily seen, and as it tends to reducethe sparking at said switching-contacts when in action to a minimum itassures a durable structure.

Other advantages will occur to those versed in the art to which myinvention pertains.

My invention may be made subject to certain modifications and yet fallwithin the scope of my present invention, particularly the mechanicalfeatures of the same, and I do not therefore wish to be understood aslimiting myself to the exact construction as shown.

\Vhat I claim as new, and desire to secure by Letters Patent, is-

1. In an electric light system, two or more are lamps in parallelconnection, each of said lamps being provided with means to maintaintheir respective carbons normally separated, derived circuits, andswitching devices for said derived circuits arranged to operate asdescribed, whereby after the carbons in the first lamp (king lamp) areconsumed to a certain point the derived circuitin said lamp may beautomatically broken and circuits through one of the other lamps in thegroup completed adapted to extinguish the are in said first lamp and tocause the light service to be continued by the carbons thus brought intoaction.

2. In an arc lamp having more than one set of carbons, said carbonsbeing intended to burn in succession and each provided with anindependent regulating mechanism in derived circuit, means to cause saidregulating mechanisms to be placed into action successively, consistingofswitching devices for said derived circuits adapted to maintain one ofthe said regulating mechanisms normally in a closed circuit and all theother regulating mechanisms in open circuits until the feed actiongoverned by said first mechanism ceases.

3. In an electric light system, the combination with two or more movableelectrodes having each an independent regulating mechanism in derivedcircuit, of switching devices for said derived circuits substantially asde scribed adapted to cause said regulating mecl1- anisms to operate ina predetermined quence, and circuits, whereby said electrodes may becaused to burn in succession.

v RUDOLPH SEGERDATIL.

'Witnesses:

J OI-IN SI-IILLESTAD, JOHN W. KILLIAN.

